What is Write-Through?

Write through is a storage method in which data is written into the cache and the corresponding storage location at the same time. The cached data allows for fast retrieval on demand, while the same data on the disk ensures that nothing will get lost if a crash, power failure, or other system disruption occurs.

vSphere Flash Read Cache: Fully Integrated with vSphere

All the management tasks pertaining to the installation, configuration & monitoring of vSphere Flash Read Cache will be done only from the vSphere client:

Each host creates a Virtual Flash Resource containing one or multiple flash based devices.

There can only be one Virtual Flash Resource per vSphere host.

Flash based devices are pooled into a new file system called VFFS.

Three options available to consume the flash

Virtual Flash Host Swap Cache (VM transparent cache)
With VM-transparent caching, the VMs will share a pool of flash resources and are not aware that they are doing so; they will simply benefit from having flash in their I/O path.
Virtual Flash Host Swap Cache provides the ability to use the Virtual Flash Resource for memory swapping.

Virtual Machine Virtual Flash Read Cache (VM-aware Cache)
With VM-aware caching, chunks of flash can be allocated on a per VM basis, and these will show up as SCSI disks in the Guest OS.
Block Size configuration capabilities Min 4KB – Max 1M

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